Nonstandard Conditions

Definition

Nonstandard conditions refer to any condition(s) not meeting the criteria for standard conditions – i.e., temperatures other than 25°C, pressures other than 1 atm, or concentrations not at 1 M.

Related terms

Nonstandard Free Energy Change (∆G): The change in free energy that occurs when reactants are converted to products under nonstandard conditions.

Le Chatelier's Principle: A principle stating that if a system at equilibrium is disturbed by changing the conditions, the system will adjust itself to partially counteract the change.

Reaction Quotient (Q):

A measure of the relative amounts of products and reactants present during a reaction at a particular point in time. It can be used to determine whether a system is at equilibrium under nonstandard conditions.